body{
    font-family: Arial;
    font-size: 12px;
    color: #c9c9c9;
    background-color: #000;
}

#content {
    background: #333;
}

.header{margin:0 auto;min-width:980px;max-width:1600px}
.header{background:rgba(0,0,0,0.5);-webkit-transition:background .300s;-moz-transition:background .300s;-o-transition:background .300s;transition:background .300s}
.header:hover{background-color:rgba(0,0,0,0.8)}